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          Android开发琐碎
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            <div class="post-description">这两年主要玩Android系统与网络，对于应用层的开发有些陌生。然而现在终究是要靠应用技术吃饭，因此，借着重新学习Jetpack，做自己项目的机会，将Android应用层开发技术学习的过程记录下来, 后续再归纳整理成可读性更高的blog。</div>

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        <h3 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h3><p>这两年主要玩Android系统与网络，对于应用层的开发有些陌生。然而现在终究是要靠应用技术吃饭，因此，借着重新学习Jetpack，做自己项目的机会，将Android应用层开发技术学习的过程记录下来, 后续再归纳整理成可读性更高的blog。</p>
<p>主要方针是，首要先学会如何使用, 初步理解原理，阶段性的整理成blog。</p>
<h3 id="积累"><a href="#积累" class="headerlink" title="积累"></a>积累</h3><ul>
<li>AppCompatActivity</li>
</ul>
<p>使用ActionBar, 包括action items, navigation 节点, 更多的ToolBar设置的api<br>内置 Dark 和 Light 主题<br>集成DrawerLayout</p>
<p>继随自AppCompatActivity的Activity必须设置Theme.AppCompat 下的主题。</p>
<ul>
<li>ActionBar, Toolbar</li>
</ul>
<p>Toolbar 是ActionBar的类属， ActionBar是主要的具体实现，用来显示标题，Application级别的一致性的导航，和交互的条目。</p>
<p>Toolbar 包含的元素，导航按钮，品牌logo, 标题与副标题，一个或多个自定义view, 行为菜单</p>
<p>ActionBar 是针对整个应用的？ 若将ActionBar 当作Activity专有的，需要设计NoActionBar主题。<br>setLogo 用来替换默认的主页导航图标</p>
<ul>
<li>Window<br>抽象类，提供标准的UI策略, 如背景，标题区域，默认的按键事件处理。只有一个实现类 PhoneWinodw。</li>
</ul>
<p>作为最顶级的View视图，添加到WinodwManager中。</p>
<ul>
<li>CoordinateLayout, AppBarLayout, CollapsingToolbarLayout, NestedScrollView, </li>
</ul>
<p>CooridinatorLayout, 加强版的FrameLayout, 用于两个场景:<br>    1. 作为顶层级的Application装饰或chrome布局<br>    2. 作为专有的与一个或多个子view交互的容器。<br>    交互的方式由Behavior定义<br>    每个子view有一个anchor, anchor所通信的id是Coordinatorlayout中的任一子view, 但不能是自己或者自己的子view, 这可以放置浮动的view相对于其他任意的内容。<br>    dodge InsetEdge 可以在重叠的时候适当移动而避免重叠。</p>
<p>AppBarLayout<br>    是一个垂直的LineageLayout, 实现了matirial design app bar 概念的特性，即滚动手势。<br>    子view通过setScrollFlags(int)和xml的属性app:layout_scrollFlags来提供滑动的特性。</p>
<p>CollapsingToolbarlayout<br>    用来包装 Toolbar, 实现折叠效果。被设计成直接用作AppBarLayout的子view</p>
<p>NestedScrollView<br>    默认支持嵌套手势的ScrollView</p>
<p>CoordinatorLayout这一套是沉浸式布局的实现， 提供了固定的几种效果。我前期倒是用不上。 后绪再研究吧。</p>
<ul>
<li><p>AppBarConfiguration, NavigationUI, NavUtils</p>
</li>
<li><p>ViewBinding</p>
<figure class="highlight gradle"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">android&#123;</span><br><span class="line">	<span class="comment">// android 4.0.-</span></span><br><span class="line">	viewBinding &#123;</span><br><span class="line">		enabled = <span class="keyword">true</span></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">// android 4.0.+ </span></span><br><span class="line">	buildFeatures&#123;</span><br><span class="line">		viewBinding = <span class="keyword">true</span></span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line">[viewbinding inclue](https:<span class="comment">//juejin.cn/post/6844904065655111693)</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>T extend Object, ? super Object</p>
</li>
</ul>
<p>extend 只能读取子类, super 只能写子类。 根本思想是只能向上转型。</p>
<ul>
<li>widget, launcher, Activity的关系</li>
</ul>
<p>manifest文件由PM描述，然后在aws中注册，通过launcher是跳转到入口Activity, 但是通过widget, notification, 可以跳转到app中任何一个Activity。<br>aws是如何找到对应的Activity呢？直接按路径加载, 这样启动的Activity会不会开启进程, 走不走zygote</p>
<ul>
<li>依赖与关联，聚合与组合</li>
</ul>
<p>依赖与关联，是从代码角度，根据变量生命周期 划分</p>
<p>聚合与组合，从业务角度，根据现实从属关系 划分, 从代码角度，封装性不同,</p>
<p>依赖、关联、聚合、组合， 耦合度依次增加, 代码表现形式上都是关联的表现形式，作为局部变量或成员变量</p>
<ul>
<li><p>classpath, apply 与 dependencies<br>classpath 用来加载插件, apply 使用插件<br>denpendencies 用来加载库</p>
</li>
<li><p>enum的使用</p>
</li>
</ul>
<p>enum最好不要使用其构造函数，可以使用一个Builder或者Impl来实现业务，这样在使用enum的时候，跟踪代码就比较方便。空间的增加可以忽略。<br>不推荐使用枚举的源头是《阿里巴巴java开发手册》，强制，枚举可用于参数，不可以用于返回值，在于版本升级，返回值会产生序例化错误。<br>我还是认同，这是反序例化库的问题，并不是java枚举的问题。枚举还是很好用的.</p>
<ul>
<li>qmui</li>
</ul>
<p>theme 观念， 产品观念</p>
<ul>
<li>音视频</li>
</ul>
<p>学习哪门技术，都得下心思，解决一个算一个<br>不管理应用开发，还是音视频，都是庞大的知识体系。还是得有所决择<br>深入音视频，更有前景一些，因此UI上的细节不必过于追究</p>
<ul>
<li><p>for 循环<br>两个分号之间添加判断，一旦不满足，就会break, 算是一个trick</p>
</li>
<li><p>桌面小组件<br>微件需显示在托管应用AppWidgetHost里，Launcher就是一个可托管微件的Host.<br>基于广播事件交互，</p>
</li>
</ul>
<p>使用步骤<br>生命周期<br>限制<br>同广播使用</p>
<ul>
<li>event bus<br>方便，但是不可以传大数据，使用广播替代？</li>
</ul>

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